(1) Place switch SW-6 in MECH.
d. Disconnect heater cable from junction
ZERO position and zero galvanometers with
box and connector.
MECH. ZERO knob.
e. Disconnect power inlet cable from
(2) Place switch SW-6 in RANGE
power source and connector P-1.
position to take temperature readings. Adjust
f. Properly stow heater probes in probe
temperature selector knob until galvanometers
storage compartment.
reads zero. Temperature is shown on C scale.
NOTE
k. Place switch SW-7 in MECH. ZERO
position and zero galvanometers with MECH.
Hot heater probes may be
ZERO knob.
stowed in the probe stor-
l. Place switch SW-7 in RANGE position.
age compartment without
m. Adjust R.P.M. knob until galvanome-
damage to the heater
ter reads zero. Read engine RPM on % scale.
probes or tester.
n. Run up and stabilize engine according
g. Properly stow heater cable, power in-
to applicable technical manual for engine.
let cable, and junction box in cable storage com-
o. Monitor engine RPM during engine
partment.
runup.
NOTE
The reading shown on %
a. Disconnect engine thermocouple leads
scale is correct RPM of
at aircraft EGT indicator.
engine. The difference
b. Connect engine thermocouple leads to
between % scale reading
proper terminals of switch box and connect
and aircraft tachometer in-
jumper leads of switch box to proper terminals
dicator reading is indi-
of aircraft EGT indicator.
cated error of aircraft
NOTE
tachometer system and
should not exceed toler-
With the switch box in
ance specified in applica-
the aircraft circuit and
ble technical manual.
switch SW-5 on switch
box in E.G.T. position,
p. Place switch SW-5 on switch box in
the aircraft EGT indicator
JETCAL position.
is in the aircraft circuit.
q. Adjust temperature select knob until
With switch SW-5 in JET-
galvanometers reads zero.
CAL position, the indica-
r. Read temperature of engine thermo-
tion of the engine ther-
couples on C scale. Difference between Jetcal
mocouple harness is car-
and EGT indicator is indicator error and should
ried back to the tester.
not exceed system tolerance.
s. Disconnect rpm check adapter at air-
c. Connect check cable to switch box and
craft tachometer cable and aircraft tachometer
to CHECK CABLE connector.
indicator. Connect aircraft tachometer cable at
d. Connect rpm check adapter to instru-
aircraft tachometer indicator.
ment cable and instrument cable to connector
t. Disconnect RPM check adapter from
P-3.
instrument cable.
e. Disconnect aircraft tachometer cable
u. Disconnect instrument cable from con-
from aircraft tachometer indicator.
nector P-3.
v. Disconnect check cable from switch box
check adapter to aircraft tachometer cable and air
and CHECK CABLE connector.
craft tachometer indicator.
w. Disconnect engine thermocouple leads
g. Place switch SW-5 on switch box in
from switch box and jumper leads of switch box
E.G.T. position (Aircraft EGT indicator must be
from aircraft EGT indicator. Connect engine
used on initial runup to be able to detect a hot
thermocouple leads at aircraft EGT indicator.
start.)
h. Place switch SW-1 in T/C position.
x. Properly stow check cable, instrument
i. Place switch SW-2 in S-2 position.
cable, switch box, and rpm check adapter in
j. Set up galvanometers as follows:
cable storage compartment.
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